Posted by Dave_W on October 28, 2009 at 05:45:11 from (204.14.57.6):
I have posted a few messages over the past week or so about having trouble getting my 9N to start. I had it running, but it was becoming harder and harder to start, and finally to the point where it wouldn"t start at all.
I cleaned the plugs (more then once), gave her the MMO treatment, rebuilt the carb (needed it anyway), readjusted the new points and adjusted the timing, all with no luck.
Well last night, I finally figured out what was wrong - One of the 2 new resistors that I had installed for the 6-volt coil (I converted tractor to 12 volt) was cracked, and as soon as I touched it, it fell apart in my hands. I bypassed it, turned her over, and she fired right up. She quickly created a smog in the barn as the MMO started to burn off, but I think I solved my problem.
I am ordering a new 12-volt coil and will just stick with the 1 resistor. My guess is that the resistor was still allowing current to flow, but the resistance had to have been quite high and the coil probably wasn"t getting enough juice to provide good, consistent spark on all 4 cylinders. Probably was slowing getting worse too, which is why I went from hard start to no start.
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